These are Crystal Clear Bags® with No Flap or Adhesive. Would hold a 4 1/2 x 6 inch flat card nicely or a set of 4 1/4 x 5 1/2 set up to about 1/2 inch thick, ideal for art, photo, and stationery when you don't want the flap to get in the way. These bags have optimal clarity and durability.